[Modernman]

Not his car. His parents have two vehicles but the car that Natalee was in was the Honda owned by the brothers. We know that one wasn't too clean since police thought it had blood in it, when it didn't.

Haven't these guys already claimed that the girl was in their car? If that's the case, finding her hair or fibres from her clothes in the car wouldn't really prove anything, IMO. They'd need blood or something else.

[Rippersnapper]

They diddn't say if they found anything. I would be more suspicious if they didn't find anything because with that long hair, there should have been hair left behind. Sometimes, what is NOT there says more than what is there.